36
36

Sep 21, 2013
09/13

by
Rafael Gregorio Lucas D'Oliveira; Marcelo Firer

texts

######
eye 36

######
favorite 0

######
comment 0

Until this work, the packing radius of a poset code was only known in the cases where the poset was a chain, a hierarchy, a union of disjoint chains of the same size, and for some families of codes. Our objective is to approach the general case of any poset. To do this, we will divide the problem into two parts. The first part consists in finding the packing radius of a single vector. We will show that this is equivalent to a generalization of a famous NP-hard problem known as "the...

Source: http://arxiv.org/abs/1301.5915v1

27
27

Sep 23, 2013
09/13

by
Osamu Fujino

texts

######
eye 27

######
favorite 0

######
comment 0

We prove some injectivity, torsion-free, and vanishing theorems for simple normal crossing pairs. Our results heavily depend on the theory of mixed Hodge structures on compact support cohomology groups. We also treat several basic properties of semi divisorial log terminal pairs.

Source: http://arxiv.org/abs/1202.4200v2

33
33

Sep 18, 2013
09/13

by
Alexandre Mauroy; Pierre Sacré; Rodolphe Sepulchre

texts

######
eye 33

######
favorite 0

######
comment 0

The paper provides an introductory discussion about two fundamental models of oscillator synchronization: the (continuous-time) diffusive model, that dominates the mathematical literature on synchronization, and the (hybrid) kick model, that accounts for most popular examples of synchronization, but for which only few theoretical results exist. The paper stresses fundamental differences between the two models, such as the different contraction measures underlying the analysis, as well as...

Source: http://arxiv.org/abs/1209.4970v3

37
37

Sep 21, 2013
09/13

by
Tomasz Klimsiak; Andrzej Rozkosz

texts

######
eye 37

######
favorite 0

######
comment 0

We consider the obstacle problem with two irregular reflecting barriers for the Cauchy-Dirichlet problem for semilinear parabolic equations with measure data. We prove the existence and uniqueness of renormalized solutions of the problem and well as results on approximation of the solutions by the penaliztion method. In the proofs we use probabilistic methods of the theory of Markov processes and the theory of backward stochastic differential equations.

Source: http://arxiv.org/abs/1301.5795v1

28
28

Sep 18, 2013
09/13

by
Ion Garate

texts

######
eye 28

######
favorite 0

######
comment 0

We show that electron-phonon interactions can alter the topological properties of Dirac insulators and semimetals, both at zero and nonzero temperature. Contrary to the common belief that increasing temperature always destabilizes topological phases, our results highlight instances in which phonons may lead to the appearance of topological surface states above a crossover temperature in a material that has a topologically trivial ground state.

Source: http://arxiv.org/abs/1209.4685v2

21
21

Sep 18, 2013
09/13

by
M. Hanussek; J. S. Kim

texts

######
eye 21

######
favorite 0

######
comment 0

In a recent paper, we proposed a hierarchical ansatz for the lepton-number-violating trilinear Yukawa couplings of the R-parity-violating minimal supersymmetric standard model. As a result, the number of free parameters in the lepton-number-violating sector was reduced from 36 to 6. Neutrino oscillation data fixes these six parameters, which also uniquely determines the decay modes of the lightest supersymmetric particle and thus governs the collider signature at the LHC. A typical signature of...

Source: http://arxiv.org/abs/1211.0725v2

26
26

Sep 21, 2013
09/13

by
S. R. Beane; E. Chang; S. D. Cohen; W. Detmold; P. Junnarkar; H. W. Lin; T. C. Luu; K. Orginos; A. Parreno; M. J. Savage; A. Walker-Loud

texts

######
eye 26

######
favorite 0

######
comment 0

The scattering lengths and effective ranges that describe low-energy nucleon-nucleon scattering are calculated in the limit of SU(3)-flavor symmetry at the physical strange-quark mass with Lattice Quantum Chromodynamics. The calculations are performed with an isotropic clover discretization of the quark action in three volumes with spatial extents of L \sim 3.4 fm, 4.5fm and 6.7 fm, and with a lattice spacing of b \sim 0.145 fm. With determinations of the energies of the two-nucleon systems...

Source: http://arxiv.org/abs/1301.5790v1

28
28

Sep 21, 2013
09/13

by
Emmanuel Jacquet

texts

######
eye 28

######
favorite 0

######
comment 0

A major uncertainty in accretion disk theory is the nature and properties of gas turbulence, which drives transport in protoplanetary disks. The commonly used viscous prescription for the Maxwell-Reynolds stress tensor gives rise to a meridional circulation where flow is outward near the midplane and inward away from it. This meridional circulation has been proposed as an explanation for the presence of high-temperature minerals (believed to be of inner solar system provenance) in comets....

Source: http://arxiv.org/abs/1301.5817v1

33
33

Sep 21, 2013
09/13

by
Ian J. M. Crossfield

texts

######
eye 33

######
favorite 0

######
comment 0

Measurements of the frequency with which short-period planets occur around main sequence stars allows a direct prediction of the number and types of such planets that will be amenable to characterization by high-contrast instruments on future giant segmented- mirror telescopes (GSMTs). Adopting conservative assumptions, I predict of order 10 planets with radii R_P=1-8 R_Earth and equilibrium temperatures

Source: http://arxiv.org/abs/1301.5884v1

37
37

Sep 21, 2013
09/13

by
Stéphane Sacuto; Sofia Ramstedt; Susanne Höfner; Hans Olofsson; Sara Bladh; Kjell Eriksson; Bernhard Aringer; Daniela Klotz; Matthias Maercker

texts

######
eye 37

######
favorite 0

######
comment 0

We study the circumstellar environment of the M-type AGB star RT Vir using mid-infrared high spatial resolution observations from the ESO-VLTI focal instrument MIDI. The aim of this study is to provide observational constraints on theoretical prediction that the winds of M-type AGB objects can be driven by photon scattering on iron-free silicate grains located in the close environment (about 2 to 3 stellar radii) of the star. We interpreted spectro-interferometric data, first using...

Source: http://arxiv.org/abs/1301.5872v1

26
26

Sep 23, 2013
09/13

by
A. Liam Fitzpatrick; Jared Kaplan; David Poland; David Simmons-Duffin

texts

######
eye 26

######
favorite 0

######
comment 0

We take an analytic approach to the CFT bootstrap, studying the 4-pt correlators of d > 2 dimensional CFTs in an Eikonal-type limit, where the conformal cross ratios satisfy |u| < < |v| < 1. We prove that every CFT with a scalar operator \phi must contain infinite sequences of operators O_{\tau,l} with twist approaching \tau -> 2\Delta_\phi + 2n for each integer n as l -> infinity. We show how the rate of approach is controlled by the twist and OPE coefficient of the leading...

Source: http://arxiv.org/abs/1212.3616v2

25
25

Sep 21, 2013
09/13

by
Jorge Neves; Maria Vaz Pinto; Rafael H. Villarreal

texts

######
eye 25

######
favorite 0

######
comment 0

We study the regularity and the algebraic properties of certain lattice ideals. We establish a map I --> I\~ between the family of graded lattice ideals in an N-graded polynomial ring over a field K and the family of graded lattice ideals in a polynomial ring with the standard grading. This map is shown to preserve the complete intersection property and the regularity of I but not the degree. We relate the Hilbert series and the generators of I and I\~. If dim(I)=1, we relate the degrees of...

Source: http://arxiv.org/abs/1301.4249v2

20
20

Sep 23, 2013
09/13

by
Vincent Nolot

texts

######
eye 20

######
favorite 0

######
comment 0

In this paper we study two basic facts of optimal transportation on Wiener space W. Our first aim is to answer to the Monge Problem on the Wiener space endowed with the Sobolev type norm (k,gamma) to the power of p (cases p = 1 and p > 1 are considered apart). The second one is to prove 1-convexity (resp. C-convexity) along (constant speed) geodesics of relative entropy in (P2(W);W2), where W is endowed with the infinite norm (resp. with (k,gamma) norm), and W2 is the 2-distance of...

Source: http://arxiv.org/abs/1111.1938v6

40
40

Sep 21, 2013
09/13

by
S. D. Baalrud; C. C. Hegna

texts

######
eye 40

######
favorite 0

######
comment 0

A kinetic theory of the Bohm criterion is developed that is based on positive-exponent velocity moments of the plasma kinetic equation. This result is contrasted with the conventional kinetic Bohm criterion that is based on a v^{-1} moment of the Vlasov equation. The salient difference between the two results is that low velocity particles dominate in the conventional theory, but are essentially unimportant in the new theory. It is shown that the derivation of the conventional kinetic Bohm...

Source: http://arxiv.org/abs/1301.5700v1

28
28

Sep 21, 2013
09/13

by
F. J. Sanchez-Salcedo; A. M. Hidalgo-Gamez; Eric E. Martinez-Garcia

texts

######
eye 28

######
favorite 0

######
comment 0

We have carried out a search for gas-rich dwarf galaxies that have lower rotation velocities in their outskirts than MOdified Newtonian Dynamics (MOND) predicts, so that the amplitude of their rotation curves cannot be fitted by arbitrarily increasing the mass-to-light ratio of the stellar component or by assuming additional undetected matter. With presently available data, the gas-rich galaxies UGC 4173, Holmberg II, ESO 245-G05, NGC 4861 and ESO 364-G029 deviate most from MOND predictions...

Source: http://arxiv.org/abs/1301.5847v1

22
22

Sep 21, 2013
09/13

by
Chris Godsil; Natalie Mullin; Aidan Roy

texts

######
eye 22

######
favorite 0

######
comment 0

We consider continuous-time quantum walks on distance-regular graphs of small diameter. Using results about the existence of complex Hadamard matrices in association schemes, we determine which of these graphs have quantum walks that admit uniform mixing. First we apply a result due to Chan to show that the only strongly regular graphs that admit instantaneous uniform mixing are the Paley graph of order nine and certain graphs corresponding to regular symmetric Hadamard matrices with constant...

Source: http://arxiv.org/abs/1301.5889v1

29
29

Sep 21, 2013
09/13

by
A. Lepailleur; O. Sorlin; L. Caceres; B. Bastin; C. Borcea; R. Borcea; B. A. Brown; L. Gaudefroy; S. Gr évy; G. F. Grinyer; G. Hagen; M. Hjorth-Jensen; G. R. Jansen; O. Llidoo; F. Negoita; F. de Oliveira; M. -G. Porquet; F. Rotaru; M. -G. Saint-Laurent; D. Sohler; M. Stanoiu; J. C. Thomas

texts

######
eye 29

######
favorite 0

######
comment 0

A long-lived $J^{\pi}=4_1^+$ isomer, $T_{1/2}=2.2(1)$ms, has been discovered at 643.4(1) keV in the weakly-bound $^{26}_{9}$F nucleus. It was populated at GANIL in the fragmentation of a $^{36}$S beam. It decays by an internal transition to the $J^{\pi}=1_1^+$ ground state (82(14)%), by $\beta$-decay to $^{26}$Ne, or beta-delayed neutron emission to $^{25}$Ne. From the beta-decay studies of the $J^{\pi}=1_1^+$ and $J^{\pi}=4_1^+$ states, new excited states have been discovered in $^{25,26}$Ne....

Source: http://arxiv.org/abs/1301.5803v1

75
75

Sep 23, 2013
09/13

by
Lucas Sourrouille

texts

######
eye 75

######
favorite 0

######
comment 0

We analyze the stability of soliton solutions in a Chern-Simons-CP(1) model. We show a condition for which the soliton solutions are stable. Finally we verified this result numerically.

Source: http://arxiv.org/abs/1111.3100v4

53
53

Sep 21, 2013
09/13

by
M. Mehrenberger; C. Steiner; L. Marradi; N. Crouseilles; E. Sonnendrucker; B. Afeyan

texts

######
eye 53

######
favorite 0

######
comment 0

This work concerns the numerical simulation of the Vlasov-Poisson set of equations using semi- Lagrangian methods on Graphical Processing Units (GPU). To accomplish this goal, modifications to traditional methods had to be implemented. First and foremost, a reformulation of semi-Lagrangian methods is performed, which enables us to rewrite the governing equations as a circulant matrix operating on the vector of unknowns. This product calculation can be performed efficiently using FFT routines....

Source: http://arxiv.org/abs/1301.5892v1

59
59

Sep 21, 2013
09/13

by
Iñaki Ucar; Jorge Navarro-Ortiz; Pablo Ameigeiras; Juan M. Lopez-Soler

texts

######
eye 59

######
favorite 0

######
comment 0

This paper presents an extensible and reusable framework which addresses the problem of video quality assessment over IP networks. The proposed tool (referred to as Video-Tester) supports raw uncompressed video encoding and decoding. It also includes different video over IP transmission methods (i.e.: RTP over UDP unicast and multicast, as well as RTP over TCP). In addition, it is furnished with a rich set of offline analysis capabilities. Video-Tester analysis includes QoS and bitstream...

Source: http://arxiv.org/abs/1301.5793v1

38
38

Sep 18, 2013
09/13

by
Yong Xu; Yongping Zhang; Biao Wu

texts

######
eye 38

######
favorite 0

######
comment 0

We study bright solitons in a Bose-Einstein condensate with a spin-orbit coupling that has been realized experimentally. Both stationary bright solitons and moving bright solitons are found. The stationary bright solitons are the ground states and possess well-defined spin-parity, a symmetry involving both spatial and spin degrees of freedom; these solitons are real valued but not positive definite, and the number of their nodes depends on the strength of spin-orbit coupling. For the moving...

Source: http://arxiv.org/abs/1211.0771v2

40
40

Sep 19, 2013
09/13

by
Enrique González-Jiménez; Xavier Xarles

texts

######
eye 40

######
favorite 0

######
comment 0

We give several criteria to show over which quadratic number fields Q(sqrt{D}) there should exists a non-constant arithmetic progressions of five squares. This is done by translating the problem to determining when some genus five curves C_D defined over Q have rational points, and then using a Mordell-Weil sieve argument among others. Using a elliptic Chabauty-like method, we prove that the only non-constant arithmetic progressions of five squares over Q(sqrt{409}), up to equivalence, is 7^2,...

Source: http://arxiv.org/abs/0909.1663v4

30
30

Sep 21, 2013
09/13

by
Emanuele Pace; Giovanni Salme'; Sergio Scopetta; Alessio Del Dotto; Matteo Rinaldi

texts

######
eye 30

######
favorite 0

######
comment 0

The possibility to extract the quark transverse-momentum distributions in the neutron from semi-inclusive deep inelastic electron scattering off polarized 3He is illustrated through an impulse approximation analysis in the Bjorken limit. The generalization of the analysis at finite momentum transfers in a Poincare' covariant framework is outlined. The definition of the light-front spin-dependent spectral function of a J=1/2 system allows us to show that within the light-front dynamics only...

Source: http://arxiv.org/abs/1301.5787v1

31
31

Sep 21, 2013
09/13

by
A. Vershik

texts

######
eye 31

######
favorite 0

######
comment 0

We define a normal form (called the canonical image) of an arbitrary measurable function of several variables with respect to a natural group of transformations; describe a new complete system of invariants of such a function (the system of joint distributions); and relate these notions to the matrix distribution, another invariant of measurable functions found earlier, which is a random matrix. Bibliography: 7 titles.

Source: http://arxiv.org/abs/1301.5724v1

37
37

Sep 21, 2013
09/13

by
Feyza Esra Erdogan; Bayram Sahin; Rifat Gunes

texts

######
eye 37

######
favorite 0

######
comment 0

In this paper we study lightlike surfaces of Minkowski 3- space such that they have degenerate or non-degenerate planar normal sections. We first show that every lightlike surface of Minkowski $3-$ space has degenerate planar normal sections. Then we study lightlike surfaces with non-degenerate planar normal sections and obtain a characterization for such lightlike surfaces.

Source: http://arxiv.org/abs/1301.5772v1

28
28

Sep 22, 2013
09/13

by
Andrew Obus

texts

######
eye 28

######
favorite 0

######
comment 0

We continue the examination of the stable reduction and fields of moduli of G-Galois covers of the projective line over a complete discrete valuation field of mixed characteristic (0, p), where G has a cyclic p-Sylow subgroup P of order p^n. Suppose further that the normalizer of P acts on P via an involution. Under mild assumptions, if f: Y --> P^1 is a three-point G-Galois cover defined over C, then the nth higher ramification groups above p for the upper numbering of the (Galois closure...

Source: http://arxiv.org/abs/1001.3723v6

35
35

Sep 21, 2013
09/13

by
Shin'ichiro Ando; Eiichiro Komatsu

texts

######
eye 35

######
favorite 0

######
comment 0

Annihilation of dark matter particles in cosmological halos (including a halo of the Milky Way) contributes to the diffuse gamma-ray background (DGRB). As this contribution will appear anisotropic in the sky, one can use the angular power spectrum of anisotropies in DGRB to constrain properties of dark matter particles. By comparing the updated analytic model of the angular power spectrum of DGRB from dark matter annihilation with the power spectrum recently measured from the 22-month data of...

Source: http://arxiv.org/abs/1301.5901v1

26
26

Sep 21, 2013
09/13

by
A. L. Marchant; T. P. Billam; T. P. Wiles; M. M. H. Yu; S. A. Gardiner; S. L. Cornish

texts

######
eye 26

######
favorite 0

######
comment 0

Solitons are non-dispersive wave solutions that arise in a diverse range of nonlinear systems, stablised by a focussing or defocussing nonlinearity. First observed in shallow water, solitons have subsequently been studied in many other fields including nonlinear optics, biophysics, astrophysics, plasma and particle physics. They are characterised by well localised wavepackets that maintain their initial shape and amplitude for all time, even following collisions with other solitons. Here we...

Source: http://arxiv.org/abs/1301.5759v1

58
58

Sep 18, 2013
09/13

by
Osmar Maldonado Molina

texts

######
eye 58

######
favorite 0

######
comment 0

We extend the complex-valued analytic torsion, introduced by Burghelea and Haller on closed manifolds, to compact Riemannian bordisms. We do so by considering a flat complex vector bundle over a compact Riemannian manifold, endowed with a fiberwise nondegenerate symmetric bilinear form. The Riemmanian metric and the bilinear form are used to define non-selfadjoint Laplacians acting on vector-valued smooth forms under absolute and relative boundary conditions. In the process to define the...

Source: http://arxiv.org/abs/1201.4753v3

24
24

Sep 21, 2013
09/13

by
Boris Brodsky; Boris Darkhovsky

texts

######
eye 24

######
favorite 0

######
comment 0

This paper deals with the problem of asymptotically optimal detection of changes in regime-switching stochastic models. We need to divide the whole obtained sample of data into several sub-samples with observations belonging to different states of a stochastic models with switching regimes. For this purpose, the idea of reduction to a corresponding change-point detection problem is used. Both univariate and multivariate switching models are considered. For the univariate case, we begin with the...

Source: http://arxiv.org/abs/1301.5722v1

31
31

Sep 21, 2013
09/13

by
M. P. Strzys; J. R. Anglin

texts

######
eye 31

######
favorite 0

######
comment 0

Stars form when cold cosmic nebulae spontaneously develop hot spots that steadily intensify until they reach fusion temperatures. Without this process, the universe would be dark and dead. Yet the spontaneous concentration of heat is exactly what the Second Law of Thermodynamics is in most cases supposed to forbid. The formation of protostars has been much discussed, for its consistency with the Second Law depends on a thermodynamical property that is common in systems whose strongest force is...

Source: http://arxiv.org/abs/1301.5825v1

32
32

Sep 20, 2013
09/13

by
Luigi Rodino; Patrik Wahlberg

texts

######
eye 32

######
favorite 0

######
comment 0

We define the Gabor wave front set $WF_G(u)$ of a tempered distribution $u$ in terms of rapid decay of its Gabor coefficients in a conic subset of the phase space. We show the inclusion $$WF_G(a^w(x,D) u) \subseteq WF_G(u), u \in \mathscr S'(\mathbb R^d), a \in S_{0,0}^0,$$ where $S_{0,0}^0$ denotes the H\"ormander symbol class of order zero and parameter values zero. We compare our definition with other definitions in the literature, namely the classical and the global wave front sets of...

Source: http://arxiv.org/abs/1207.5628v2

22
22

Sep 23, 2013
09/13

by
Hong Van Le; Petr Somberg; Jiri Vanzura

texts

######
eye 22

######
favorite 0

######
comment 0

In this note we introduce the notion of a smooth structure on a conical pseudomanifold $M$ in terms of $C^\infty$-rings of smooth functions on $M$. For a finitely generated smooth structure $C^\infty (M)$ we introduce the notion of the Nash tangent bundle, the Zariski tangent bundle, the tangent bundle of $M$, and the notion of characteristic classes of $M$. We prove the vanishing of a Nash vector field at a singular point for a special class of Euclidean smooth structures on $M$. We introduce...

Source: http://arxiv.org/abs/1006.5707v6

27
27

Sep 21, 2013
09/13

by
Marcy Barge; Luca Q. Zamboni

texts

######
eye 27

######
favorite 0

######
comment 0

In this paper we establish a new connection between central sets and the strong coincidence conjecture for fixed points of irreducible primitive substitutions of Pisot type. Central sets, first introduced by Furstenberg using notions from topological dynamics, constitute a special class of subsets of $\nats$ possessing strong combinatorial properties: Each central set contains arbitrarily long arithmetic progressions, and solutions to all partition regular systems of homogeneous linear...

Source: http://arxiv.org/abs/1301.5745v1

24
24

Sep 21, 2013
09/13

by
Daniel T. Cassidy

texts

######
eye 24

######
favorite 0

######
comment 0

A homogeneously saturated equation for the time development of the price of a financial asset is presented and investigated for the pricing of European call options using noise that is distributed as a Student's t-distribution. In the limit that the saturation parameter of the equation equals zero, the standard model of geometric motion for the price of an asset is obtained. The homogeneously saturated equation for the price of an asset is similar to a simple equation for the output of a...

Source: http://arxiv.org/abs/1301.5877v1

34
34

Sep 21, 2013
09/13

by
Virginia Hogan; Steven J. Miller

texts

######
eye 34

######
favorite 0

######
comment 0

We study the relationship between the number of minus signs in a generalized sumset, $A+...+A-...-A$, and its cardinality; without loss of generality we may assume there are at least as many positive signs as negative signs. As addition is commutative and subtraction is not, we expect that for most $A$ a combination with more minus signs has more elements than one with fewer; however, recently Iyer, Lazarev, Miller and Zhang proved that a positive percentage of the time the combination with...

Source: http://arxiv.org/abs/1301.5703v1

40
40

Sep 23, 2013
09/13

by
Bodo Lampe

texts

######
eye 40

######
favorite 0

######
comment 0

This note supplements a recent article in which it was pointed out that the observed spectrum of quarks and leptons can arise as quasi-particle excitations in a discrete internal space. The paper concentrated on internal vibrational modes and it was only noted in the end that internal spin waves ('mignons') might do the same job. Here it will be shown how the mignon-mechanism works in detail. In particular the Shubnikov group $A_4 + S (S_4 - A_4)$ will be used to describe the spectrum, and the...

Source: http://arxiv.org/abs/1212.0753v2

40
40

Sep 21, 2013
09/13

by
Noyan Er; Surjeet Singh; Ashish K. Srivastava

texts

######
eye 40

######
favorite 0

######
comment 0

It is proved, among other results, that a prime right nonsingular ring (in particular, a simple ring) $R$ is right self-injective if $R_R$ is invariant under automorphisms of its injective hull. This answers two questions raised by Singh and Srivastava, and Clark and Huynh. An example is given to show that this conclusion no longer holds when prime ring is replaced by semiprime ring in the above assumption. Also shown is that automorphism-invariant modules are precisely pseudo-injective...

Source: http://arxiv.org/abs/1301.5841v1

47
47

Sep 21, 2013
09/13

by
Weihua Geng; Ferosh Jacob

texts

######
eye 47

######
favorite 0

######
comment 0

In this paper, we present a GPU-accelerated direct-sum boundary integral method to solve the linear Poisson-Boltzmann (PB) equation. In our method, a well-posed boundary integral formulation is used to ensure the fast convergence of Krylov subspace based linear algebraic solver such as the GMRES. The molecular surfaces are discretized with flat triangles and centroid collocation. To speed up our method, we take advantage of the parallel nature of the boundary integral formulation and...

Source: http://arxiv.org/abs/1301.5885v1

51
51

Sep 21, 2013
09/13

by
A. Ciaravella; D. F. Webb; S. Giordano; J. C. Raymond

texts

######
eye 51

######
favorite 0

######
comment 0

Current sheets are important signatures of magnetic reconnection in the eruption of confined solar magnetic structures. Models of Coronal Mass Ejections (CMEs) involve formation of a current sheet connecting the ejected flux rope with the post eruption magnetic loops. Current sheets have been identified in white light images of CMEs as narrow rays trailing the outward moving CME core, and in ultraviolet spectra as narrow bright features emitting the Fe XVIII line. In this work samples of rays...

Source: http://arxiv.org/abs/1301.5862v1

37
37

Sep 21, 2013
09/13

by
Maciej Janowicz; Arkadiusz Orłowski

texts

######
eye 37

######
favorite 0

######
comment 0

Three quantitative measures of the spatiotemporal behavior of the coupled map lattices: reduced density matrix, reduced wave function, and an analog of particle number, have been introduced. They provide a quantitative meaning to the concept of coherence which in the context of complex systems have been used rather intuitively. Their behavior suggests that the logistic coupled-map lattices approach the states which resemble the condensed states of systems of Bose particles. In addition, pattern...

Source: http://arxiv.org/abs/1301.0231v2

38
38

Sep 23, 2013
09/13

by
Stephen Pankavich; Petronela Radu

texts

######
eye 38

######
favorite 0

######
comment 0

We consider semilinear evolution equations of the form $a(t)\partial_{tt}u + b(t) \partial_t u + Lu = f(x,u)$ and $b(t) \partial_t u + Lu = f(x,u),$ with possibly unbounded $a(t)$ and possibly sign-changing damping coefficient $b(t)$, and determine precise conditions for which linear instability of the steady state solutions implies nonlinear instability. More specifically, we prove that linear instability with an eigenfunction of fixed sign gives rise to nonlinear instability by either...

Source: http://arxiv.org/abs/1110.6240v3

34
34

Sep 20, 2013
09/13

by
Pierre-François Loos

texts

######
eye 34

######
favorite 0

######
comment 0

We show that the expression of the high-density (i.e small-$r_s$) correlation energy per electron for the one-dimensional uniform electron gas can be obtained by conventional perturbation theory and is of the form $\Ec(r_s) = -\pi^2/360 + 0.00845 r_s + ...$, where $r_s$ is the average radius of an electron. Combining these new results with the low-density correlation energy expansion, we propose a local-density approximation correlation functional, which deviates by a maximum of 0.1...

Source: http://arxiv.org/abs/1207.6849v3

26
26

Sep 18, 2013
09/13

by
Jonathan Meair; Philippe Jacquod

texts

######
eye 26

######
favorite 0

######
comment 0

We construct a scattering theory of weakly nonlinear thermoelectric transport through sub-micron scale conductors. The theory incorporates the leading nonlinear contributions in temperature and voltage biases to the charge and heat currents. Because of the finite capacitances of sub-micron scale conducting circuits, fundamental conservation laws such as gauge invariance and current conservation require special care to be preserved. We do this by extending the approach of Christen and...

Source: http://arxiv.org/abs/1211.5583v2

33
33

Sep 21, 2013
09/13

by
Wenlin Gong; Chengqiang Zhao; Jia Jiao; Enrong Li; Mingliang Chen; Hui Wang; Wendong Xu; Shensheng Han

texts

######
eye 33

######
favorite 0

######
comment 0

Compared with two-dimensional imaging, three-dimensional imaging is much more advantageous to catch the characteristic information of the target for remote sensing. We report a range-resolving ghost imaging ladar system together with the experimental demonstration of three-dimensional remote sensing with a large field of view. The experiments show that, by measuring the correlation function of intensity fluctuations between two light fields, a three-dimensional map at about 1.0 km range with 25...

Source: http://arxiv.org/abs/1301.5767v1

57
57

Sep 21, 2013
09/13

by
Yuji Terashima; Masahito Yamazaki

texts

######
eye 57

######
favorite 0

######
comment 0

We conjecture that a new class of 3d N=2 theories are associated with a quiver Q and a mutation sequence m on it. We define the cluster partition function from the pair (Q, m), and this partition function coincides with the S^3_b partition function of the associated 3d N=2 theory T[(Q,m)]. Our formalism includes the case where 3d N=2 theories arise from the compactification of the 6d (2,0) A_{N-1} theory on a large class of 3-manifolds M, including complements of arbitrary links in S^3. In this...

Source: http://arxiv.org/abs/1301.5902v1

51
51

Sep 21, 2013
09/13

by
Shu-Hui Luo; An-Min Wang

texts

######
eye 51

######
favorite 0

######
comment 0

We present the generalized version of Wang's protocol[A.M.Wang, Phys.Rev.A 74,032317 (2006)] for the remote implementation(sometimes referred to as quantum remote control) of partially unknown quantum operations. The protocol only requires no more than half of the entanglements used in Bidirectional Quantum State Teleportation. We also propose a protocol for another form of quantum remote control. It can remotely implement a unitary operation which is a combination of the projective...

Source: http://arxiv.org/abs/1301.5866v1

28
28

Sep 22, 2013
09/13

by
I. Antoniadis; D. M. Ghilencea

texts

######
eye 28

######
favorite 0

######
comment 0

For a 4D N=1 supersymmetric model with a low SUSY breaking scale (f) and general Kahler potential K(Phi^i,Phi_j^*) and superpotential W(Phi^i) we study, in an effective theory approach, the relation of the goldstino superfield to the (Ferrara-Zumino) superconformal symmetry breaking chiral superfield X. In the presence of more sources of supersymmetry breaking, we verify the conjecture that the goldstino superfield is the (infrared) limit of X for zero-momentum and Lambda->\infty. (Lambda is...

Source: http://arxiv.org/abs/1210.8336v2

42
42

Sep 20, 2013
09/13

by
CMS Collaboration

texts

######
eye 42

######
favorite 0

######
comment 0

Results from the first study of isolated-photon + jet correlations in relativistic heavy ion collisions are reported. The analysis uses data from PbPb collisions at a centre-of-mass energy of 2.76 TeV per nucleon pair corresponding to an integrated luminosity of 150 inverse microbarns recorded by the CMS experiment at the LHC. For events containing an isolated photon with transverse momentum pt(gamma) > 60 GeV and an associated jet with pt(Jet) > 30 GeV, the photon + jet pt imbalance is...

Source: http://arxiv.org/abs/1205.0206v2

54
54

Sep 18, 2013
09/13

by
Yongjin Jiang; Tony Low; Kai Chang; Mikhai I. Katsnelson; Francisco Guinea

texts

######
eye 54

######
favorite 0

######
comment 0

The generation of valley current is a fundamental goal in graphene valleytronics but no practical ways of its realization are known yet. We propose a workable scheme for the generation of bulk valley current in a graphene mechanical resonator through adiabatic cyclic deformations of the strains and chemical potential in the suspended region. The accompanied strain gauge fields can break the spatial mirror symmetry of the problem within each of the two inequivalent valleys, leading to a fnite...

Source: http://arxiv.org/abs/1209.1770v2